Transmitter or receiver.



TRANSMITTER OR RECEIVER.

APPLICATION FILED JUNE 28.19M-

1,270,920. Patented July 2,1918.

Fig.1.. 1 Fig.2..

IN VE N TOR Kmzradfl fl By I ATTORNEYS WITNESSES KONRAD BOTZ, OF NEW YORK, N. Y.

TRANSMITTER OR RECEIVER.

Specification of Letters Patent.

Patented July 2, 1918.

Application filed June 28, 1917. Serial No. 177,491.

To all whom it may concern:

Be it known that I, KONRAD Bo'rz, a citizen of Germany, (first naturalization papers having been obtained,) and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Transmitter or Receiver, of which the following is a. full, clear, and exact description.

This invention. relates to a device adapted to be used in telephony for converting sound waves into electrical impulses or electrical impulses into sound waves.

The invention has for its general object to improve the construction and operation of transforming devices of this character so as tobe reliable and efficient in use, and possess extreme sensitiveness and superior sound or electrical impulse-transforming qualities.

A more specific object of the invention is the provision of a transmitter or receiver of the diaphragm type, which has operatively connected with the diaphragm an oscillator element in the form of a hel cal cone of magnetic and current-conducting material, which so influences the magnetlc field when the diaphragm is actuated that current impulses will flow through the C11- cuit in which the oscillator is connected, and furthermore the passage of electric impulses through the magnetic oscillator so influences the magnetic field that the diaphragm Wlll. be oscillated to emit the original sounds which set up the electrical impulses 1n the metallic circuit of an ordinary telephone system or in the ether in a wireless telephone system.

With such objects in view, and others which will appear as the description proceeds, the invention comprises various novel features of construction and arrangement of parts which will be set forth withparticularity in the following description and claims appended hereto.

In the accompanying drawings, wh ch illustrate one embodiment of the invention and wherein similar characters of reference indicate corresponding parts in all the views,

Figure 1 is a central vertical section of the device;

Fig. 2 is a diagrammatic vlew illustrating the magnetic field and its relation to the Fig. 3 is a front view with the mouthpiece partly broken away;

Figs. 1 and 5 are diagrammatic views of the telephone circuits with the transmitting and receiving means therein.

Referring to the drawing, 1 designates a mica or other non-metallic diaphragm which is clamped at its periphery between the mouth or ear-piece 2 and conical shell or casmg 3. This casing has a flange 1 at 1ts smaller end so as to constitute a spool on which is wounda magnetizing coil 5 that has its terminals 6 and 7 connected w1th a source of continuous current 8, as shown in Fig. 1.- Within the casing 3 is the oscillator 9 which is a conical helix made of iron, steel or other material which is both magnetic and conductive. One end of the helix is connected by a button or suitable fastening 10 to the center of the diaphragm 1, and also connected with this button is a flexible conductor 11 which passes through an eyelet 12 in the piece 2, so that the helix or oscillator can be connected with a circuit.

The smaller end of the helix is connected at 13 with the back of the casing 3, where a binding post 14 is provided, whereby the helix can be connected with an outside circuit. It will thus be seen that the oscillator is supported only at its ends, and'all the convolutions are free from each other and out of contact with any conducting material. When the diaphragm oscillates, the convolutions will move relatively toward and from each other, which will vary the intensity of the magnetic field produced by the winding 5, and this variation will cause an electromotive force to be set up in the convolutions, whereby a high frequency current will be generated when the diaphragm 1 is oscillated by the impingement of sound vibrations thereon. If current impulses pass through the oscillator the field of force generated by the current flowing through the convolutions will react on the field developed by the coil 5, and motion will be imparted to the diaphragm that will set up sound vibrations. In Fig. 2 the arrow lines represent the field of force developed by the winding, whereby the convolutions of the oscillator are magnetized.

The oscillator 9 can be connected with telephone lilies I and 16 through the; usual induction coil or transformer T, as shown in Fig. 4, or it may be connected directly 5 with the line wires 17 and'18,"asshown'in Fig. 5. The oscillators in this figure are represented as permanently magnetic, so ,thata -fie)d c0il equivalent to 5, Figs. 1 and 4,wi1l n t be'required. In this case the l vibration of the diaphragnrl causes the convolutions of the oscillator to move toward and from each other, which results in a rapid change in the density of the magnetic -field, whieh'inturn causes'a high frequency current to be developed'in the conductive oscillator. At' the* receiving end ofthe circuit the 'high frequency current impulses flowing through the convolutions of the oscillator will cause the oscillator to me- 20. chanica-lly oscillate and vibrate the *dia- :phragm,"which'sets up sound vibrations.

From the-foregoingdescription taken in connection Witht'the accompanying draw- -in-gs; the advantages of the construction and method of operation will be readily understood by those skilled in' the art to which the invention'appertains, and while I have described the principle of operation, to-

gether with the device which I'now con- "jsi'der' tobe the bestfembodiment thereof. I

desire to have it understood that the device shown is merely illustrative and that such changes maybe made when desired as fall within the scope of the appended claims.

Havingthus described my invention, I claim as new and desire to secure by Letters Patent:

'1. A deviceoi-the class described including a non-metallic diaphragm, a conical cuit, and means for enveloping the helix in a magnetic field.

2. A device of the class described including a non-metallic diaphragm, a conical 'hehx 'of conducting and magnetic material having one end fastened to the diaphragm and the other end fixed, means for connect.-

ing the ends of the helix in an electric cir cu-it, a magnetizing coil surroundingthe helix, and a source of continuous current connected with the C01l.

1 KONRAD BOTZ. 

